CN107604120A - Low-phosphorous low-sulfur method for making steel - Google Patents
Low-phosphorous low-sulfur method for making steel Download PDFInfo
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Abstract
The invention belongs to iron and steel smelting technology field, and in particular to a kind of low-phosphorous low-sulfur method for making steel.For prior art smelt steel in be harmful to phosphorus, sulfur content it is high the problems such as, the present invention provides a kind of low-phosphorous low-sulfur method for making steel, molten iron used in steel-making is vanadium-titanium-iron-water, this method stirs dephosphorization, injection lime including desulphurization and slag skimming, the vanadium extraction of converter extracting vanadium Dephosphorization, half steel converter catch carbon pair slags steel-making, the LF stoves carried out successively and skimmed and LF stove deoxidization desulfuration steps, by being defined to the parameter in each step, phosphorus content in endpoint molten steel composition can be dropped to less than 0.001%, while the sulfur content in endpoint molten steel composition drops to less than 0.0005%.
Description
Technical field
The invention belongs to iron and steel smelting technology field, and in particular to a kind of low-phosphorous low-sulfur method for making steel.
Background technology
With the fast development of economic construction, requirement more and more higher of the market to the performance of steel, clean steel is promoted
The exploitation of production technology.There is qualitative leap, nippon and South Korea's Pu item after the nineties in last century in the degree of purity of steel
[P], [S], [O], [N], the optimum level of [H] five big element total content have also reached 60 × 10 in deep punching steel-6.Although nearly 20
Domestic ferrous metallurgical industry obtains tremendous development over year, and new equipment, new technology are widely used and promoted, but domestic at present
Steel still suffer from larger performance gap compared with external high-quality steel, and the degree of purity of wherein steel is not high, harmful element content is more
It is one of the main reasons, wherein phosphorus, sulphur are wherein main harmful elements.
(1) in steel extremely low sulphur smelting process
For most of steel grades, sulphur is harmful element.The maximum harm of sulphur is in hot-working, is occurred hot-short.In addition,
Sulphide inculsion has an effect on the mechanical property of steel.Sulfur content increase in steel, the content of sulphide inculsion increases therewith, steel it is tough
Property reduce.The main contents of ultra-low sulphur steel smelting process and technology include：
1) desulfurizing iron pre-processes；
2) pneumatic steelmaking desulfurization；
3) external refining depth desulfurization；
4) anti-non-return sulphur technology.
In terms of molten iron pretreatment desulfurizing, domestic Baosteel, the pretreated sulfur content of the molten iron of Wuhan Iron and Steel Plant also can reach 0.001
~0.002%, the advanced enterprises such as Japan, America and Europe, which use, to dust in hot-metal bottle or torpedo hot metal mixer car and sulphur can be down into 90 × 10-6Left and right, or
Person sprays magnesium powder in steel mill ladle and carries out deep desulfurization, and sulphur is taken off to 50 × 10-6Hereinafter, the difference of China and Foreign Advanced Lerel
Away from be mainly reflected in desulfurization clinker after desulfurization pretreatment with the quantity of slag, molten steel stove outside deep desulfurization technology.
In deep desulfurization technical elements, domestic Baosteel can control w [S] 10 × 10-6Left and right, the low-sulfur product made from steel of Wuhan Iron and Steel Plant
W [S]=20 × 10 in steel-6, and w [S]=45 × 10 in the low-sulfur product made from steel of Anshan iron and steel plant-6, this steel at present also can steady production w [S]
<40×10-6Low-sulfur steel, but compared with Japan, American-European iron and steel enterprise, such as high-strength line-pipe steel, [S]<10×10-6Deng steel
Very big gap also be present in kind.Japan has possessed S in steel<3×10-6Technical merit.For example, Xin Koutie great subsidiary factories RH is blown CaO-
CaF2Desulfurizing agent, sulphur is taken off to 5 × 10-6Below；Xin Koutie Nagoyas factory RH-PB adds CaO-CaF2Desulfurizing agent, terminal sulphur contain
Amount is less than 10 × 10-6.American-European countries is likewise supplied with the technical merit of deep desulfurization, and the sulfur content after refining treatment in molten steel can also
Reach 10 × 10-6Below.
(2) extremely low phosphoretic steel smelting process
Phosphorus has a significant impact to the temper brittleness of the ductility of steel, low-temperature flexibility, quenched and tempered steel, and requirement of the high-quality steel to phosphorus is
Current less than 0.015% is reduced to by past 0.02%~0.04%.A small number of steel grades, such as the low temperature containing Ni9% or so
Storage tank steel, it is desirable to which phosphorus content is below 0.003%.Domestic advanced enterprises such as Baosteel, Wuhan Iron and Steel Plant be provided with produce in enormous quantities [P]≤
0.015%th, the steel grade ability of [P]≤0.010%, such as pipeline X70, X80, electrical steel etc., its converter terminal [P]≤
0.005%th, rephosphorization amount P in ladle]≤0.003%.
The production of Nippon Steel enterprise is low-phosphorous and ultra-low phosphoretic steel technological world is advanced, can be according to the phosphorus content requirement of production steel grade
Using different smelting processes.Mostly using the low-phosphorous pipe line steel of traditional " double slags " technique productions, cost is high for domestic steel mill, dephosphorization effect
Rate is low.
The present invention for how to reduce in steel be harmful to phosphorus, sulphur and propose a kind of method for making steel of the extremely low sulphur of extremely low phosphorus, mesh
Be that the phosphorus content in endpoint molten steel composition is dropped to less than 0.001%, while the sulfur content in endpoint molten steel composition drops to
Less than 0.0005%.
The content of the invention
The invention provides a kind of low-phosphorous low-sulfur method for making steel, it is intended to solves the phosphorus content in endpoint molten steel composition and sulphur contains
The problem of amount is higher.
The technical solution adopted for the present invention to solve the technical problems is：A kind of low-phosphorous low-sulfur method for making steel is provided, made steel
Molten iron used is vanadium-titanium-iron-water, and the main component of the vanadium-titanium-iron-water is
C：3.5%~4.8%, Si：0.1%~1.0%, Mn：0.1%~1.0%, V：0.05~0.4%, Ti：0.05
~0.5%, S：0.060~0.10%, P：0.060~0.080%, surplus Tfe, temperature are 1250 DEG C~1390 DEG C；
This method includes the double slag refinings of desulphurization and slag skimming, the vanadium extraction of converter extracting vanadium Dephosphorization, half steel converter catch carbon carried out successively
Steel, LF stoves stirring dephosphorization, injection lime are simultaneously skimmed and LF stove deoxidization desulfuration steps；
In the desulphurization and slag skimming step, injection magnesium powder dosage be 0.9~1.2kg/t iron, passive lime dosage for 3.5~
4.5kg/ iron；
In the converter extracting vanadium Dephosphorization vanadium extraction step, lime adding amount is 10~20kg/t steel, cooled agglomerated pellet dosage
For 30~50kg/t steel, oxygen demand is controlled in 10~15m3Between/t steel, half steel temperature control is between 1350~1450 DEG C；
In the double slag steel-making steps of the half steel converter catch carbon, using quartz sand slag making, quartz sand dosage is 10~15kg/t
Steel；When endpoint molten steel carbon content is 0.3~0.6%, the slagging of falling stove, slagging amount is the 1/2~2/3 of the quantity of slag at that time；Smelt knot
Shu Gangshui oxygen activity ＞ 600ppm；Residue adjustment is carried out using dolomitic lime before tapping, dolomitic lime dosage is 4~6kg/t steel；Converter
Tapping process adds 4~6kg/t of active lime steel and fluorite 0.8~1.2kg/t steel；
In the LF stoves stirring dephosphorization step, the molten steel LF stove not deoxidations of the double slag steel-making step productions of half steel converter catch carbon,
Processing procedure adds fluorite 0.8~1.2kg/t steel, active lime 10~20kg/t steel；The stir process time is not less than 20 minutes,
Argon stirring extent is defined by the exposed diameter of molten steel no more than 20cm；
In the injection lime and step of skimming, lime injecting velocity is controlled between 45~50kg/min, is blown the time
Control is in 12min；After injection terminates, molten steel is skimmed, bright face rate ＞ 85%；Processing terminate add ladle top slag 0.3~
0.5kg/t steel；
In the LF stoves deoxidization desulfuration step, alloying is carried out using high carbon ferromanganese, ferrosilicon first；Then carry out determining oxygen to feed
Enter aluminum steel+ladle top slag deoxidation, Als is controlled between 0.04~0.06%, and active lime addition is 15~25kg/t steel, firefly
Stone addition is 3~5kg/t steel；Argon stir process degree is defined by the exposed diameter of molten steel no more than 20cm, at Argon stirring
The time is managed not less than 8 minutes；
Wherein, the content of above-mentioned each chemical composition is by weight percentage.
It is further that in the double slag steel-making steps of the half steel converter catch carbon, dolomitic lime composition is
CaO：40~50%, MgO：30~40%, surplus CaCO3And MgCO3；
Active lime composition is
CaO：>=90%, surplus CaCO3；
Wherein, the content of above-mentioned each chemical composition is by weight percentage.
It is further that in the injection lime and step of skimming, ladle top slag composition is
Al2O3:35~45%, CaO：30~40%, Al：25~35%,
Wherein, the content of above-mentioned each chemical composition is by weight percentage.
Beneficial effects of the present invention are：Can be by endpoint molten steel composition by low-phosphorous low-sulfur method for making steel disclosed by the invention
In phosphorus content drop to less than 0.001%, while the sulfur content in endpoint molten steel composition drops to less than 0.0005%.
Embodiment
The present invention provides a kind of low-phosphorous low-sulfur method for making steel, and molten iron used in this method steel-making is vanadium-titanium-iron-water, the vanadium titanium
The main component of molten iron is
C：3.5%~4.8%, Si：0.1%~1.0%, Mn：0.1%~1.0%, V：0.05~0.4%, Ti：0.05
~0.5%, S：0.060~0.10%, P：0.060~0.080%, surplus Tfe, temperature are 1250 DEG C~1390 DEG C；
This method includes the double slag refinings of desulphurization and slag skimming, the vanadium extraction of converter extracting vanadium Dephosphorization, half steel converter catch carbon carried out successively
Steel, LF stoves stirring dephosphorization, injection lime are simultaneously skimmed and LF stove deoxidization desulfuration steps；
In the desulphurization and slag skimming step, injection magnesium powder dosage be 0.9~1.2kg/t iron, passive lime dosage for 3.5~
4.5kg/ iron；
In the converter extracting vanadium Dephosphorization vanadium extraction step, lime adding amount is 10~20kg/t steel, cooled agglomerated pellet dosage
For 30~50kg/t steel, oxygen demand is controlled in 10~15m3Between/t steel, half steel temperature control is between 1350~1450 DEG C；
In the double slag steel-making steps of the half steel converter catch carbon, using quartz sand slag making, quartz sand dosage is 10~15kg/t
Steel；When endpoint molten steel carbon content is 0.3~0.6%, the slagging of falling stove, slagging amount is the 1/2~2/3 of the quantity of slag at that time；Smelt knot
Shu Gangshui oxygen activity ＞ 600ppm；Residue adjustment is carried out using dolomitic lime before tapping, dolomitic lime dosage is 4~6kg/t steel；Converter
Tapping process adds 4~6kg/t of active lime steel and fluorite 0.8~1.2kg/t steel；
In the LF stoves stirring dephosphorization step, the molten steel LF stove not deoxidations of the double slag steel-making step productions of half steel converter catch carbon,
Processing procedure adds fluorite 0.8~1.2kg/t steel, active lime 10~20kg/t steel；The stir process time is not less than 20 minutes,
Argon stirring extent is defined by the exposed diameter of molten steel no more than 20cm；
In the injection lime and step of skimming, lime injecting velocity is controlled between 45~50kg/min, is blown the time
Control is in 12min；After injection terminates, molten steel is skimmed, bright face rate ＞ 85%；Processing terminate add ladle top slag 0.3~
0.5kg/t steel；
In the LF stoves deoxidization desulfuration step, alloying is carried out using high carbon ferromanganese, ferrosilicon first；Then carry out determining oxygen to feed
Enter aluminum steel+ladle top slag deoxidation, Als is controlled between 0.04~0.06%, and active lime addition is 15~25kg/t steel, firefly
Stone addition is 3~5kg/t steel；Argon stir process degree is defined by the exposed diameter of molten steel no more than 20cm, at Argon stirring
The time is managed not less than 8 minutes；
Wherein, the content of each chemical composition by weight percentage, similarly hereinafter；" following ", " more than " should be understood as including
This number.
Specifically, in the double slag steel-making steps of the half steel converter catch carbon, dolomitic lime composition is
CaO：40~50%, MgO：30~40%, surplus CaCO3And MgCO3；
Active lime composition is
CaO：>=90%, surplus CaCO3。
Specifically, in the injection lime and step of skimming, ladle top slag composition is
Al2O3:35~45%, CaO：30~40%, Al：25~35%.
The phosphorus content in endpoint molten steel composition will can be dropped to by low-phosphorous low-sulfur method for making steel disclosed by the invention
Less than 0.001%, while the sulfur content in endpoint molten steel composition drops to less than 0.0005%.
With reference to embodiment, the invention will be further described：
Embodiment 1 is made steel using the inventive method
Raw material：Hot metal containing V-Ti, main component are
C：4.4%th, Si：0.22%th, Mn：0.20%th, V：0.17%th, Ti：0.25%th, S：0.080%th, P：0.075%, it is remaining
It is 1270 DEG C to measure as Tfe, temperature.
First step process, carry out desulphurization and slag skimming：In this step process, injection magnesium powder dosage is 1.1kg/t iron, and passive lime is used
Measure as 4.0kg/ iron.Molten steel sulfur content is 0.0075% after processing.
Second step process, converter extracting vanadium Dephosphorization vanadium extraction：In this step process, lime adding amount is 15kg/t steel, is freezed off
Pelletizing dosage is 40kg/t steel, oxygen demand 12.5m3/ t steel, half steel temperature are 1390 DEG C.Half obtained composition of steel includes：C：
3.4%th, Si：0.01%th, Mn：0.01%th, V：0.02%th, Ti：0.02%th, S：0.0075%th, P：0.04%th, surplus Tfe.
Three-procedure, the double slag steel-making of half steel converter catch carbon：In this step process, using quartz sand slag making, quartz sand dosage
For 12.5kg/t steel；When the carbon content of endpoint molten steel is 0.45%, the slagging of falling stove, slagging amount is the 1/2 of the quantity of slag at that time；Smelt
It is 800ppm to terminate molten steel oxygen activity；Residue adjustment is carried out using dolomitic lime before tapping, dolomitic lime dosage is 5kg/t steel；Converter
Tapping process adds active lime 5kg/t steel and fluorite 1.0kg/t steel.The content of sulphur and phosphorus is respectively S in molten steel after processing：
0.005%th, P：0.0055%.
4th step process, LF stoves stirring dephosphorization：In this step process, molten steel adds in LF stoves first not deoxidation, processing procedure
Fluorite 1.0kg/t steel, active lime 15kg/t steel, stir process time are 24 minutes, and Argon stirring extent is exposed straight with molten steel
Footpath is defined no more than 18cm.The content of sulphur and phosphorus is respectively S in molten steel after processing：0.0035%th, P：0.0015%.
5th step process, it is blown lime and skims, in this step process：Molten steel carries out lime blowing process, stone using spray gun
Grey injecting velocity controls according to 47.5kg/min, is blown time 12min；After injection terminates, molten steel is skimmed, bright face rate
88%；Processing adds 0.4kg/t steel ladle top slags after terminating.The content of sulphur and phosphorus is respectively S in molten steel after processing：0.002%th,
P：0.00075%.
6th step process, LF stove deoxidization desulfuration techniques, this is walked in process：Alloy is carried out using high carbon ferromanganese, ferrosilicon first
Change, such as Q235 steel grades, high carbon ferromanganese alloy addition 2.5kg/ stoves, Antaciron 3kg/ stoves；Then oxygen feeding aluminum steel+ladle is determined
Slag deoxidation is pushed up, the control of Als contents is 0.05%, and active lime addition is 20kg/t steel, and fluorite addition is 4kg/t steel；Blow
Argon stir process degree is defined by the exposed diameter of molten steel no more than 20cm, 8 minutes Argon stir process time.After processing in molten steel
The content of sulphur and phosphorus is respectively S：0.00025%th, P：0.00075%, reach target call.
Subsequent technique, such as RH, continuous casting, according to steel-making general technology.
Embodiment 2 is made steel using the inventive method
Raw material：Hot metal containing V-Ti, main component are
C：3.5%th, Si：0.1%th, Mn：0.1%th, V：0.05%th, Ti：0.05%th, S：0.060%th, P：0.06%, surplus
For Tfe, temperature is 1250 DEG C.
First step process, carry out desulphurization and slag skimming：In this step process, injection magnesium powder dosage is 0.9kg/t iron, and passive lime is used
Measure as 3.5kg/ iron.Molten steel sulfur content is 0.007% after processing.
Second step process, converter extracting vanadium Dephosphorization vanadium extraction：In this step process, lime adding amount is 10kg/t steel, is freezed off
Pelletizing dosage is 30kg/t steel, oxygen demand 10m3/ t steel, half steel temperature are 1350 DEG C.Half obtained composition of steel includes：C：
3%th, Si：0.01%th, Mn：0.01%th, V：0.02%th, Ti：0.001%th, S：0.0055%th, P：0.01%th, surplus Tfe.
Three-procedure, the double slag steel-making of half steel converter catch carbon：In this step process, using quartz sand slag making, quartz sand dosage
For 10kg/t steel；When the carbon content of endpoint molten steel is 0.3%, the slagging of falling stove, slagging amount is the 1/2 of the quantity of slag at that time；Smelt knot
Shu Gangshui oxygen activities are 900ppm；Residue adjustment is carried out using dolomitic lime before tapping, dolomitic lime dosage is 4kg/t steel；Converter goes out
Steel process adds active lime 4kg/t steel and fluorite 0.8kg/t steel.The content of sulphur and phosphorus is respectively S in molten steel after processing：
0.004%th, P：0.005%.
4th step process, LF stoves stirring dephosphorization：In this step process, molten steel adds in LF stoves first not deoxidation, processing procedure
Fluorite 0.8kg/t steel, active lime 10kg/t steel, stir process time are 22 minutes, and Argon stirring extent is exposed straight with molten steel
Footpath is defined no more than 16cm.The content of sulphur and phosphorus is respectively S in molten steel after processing：0.003%th, P：0.001%.
5th step process, it is blown lime and skims, in this step process：Molten steel carries out lime blowing process, stone using spray gun
Grey injecting velocity controls according to 45kg/min, is blown time 12min；After injection terminates, molten steel is skimmed, bright face rate
87%；Processing adds 0.3kg/t steel ladle top slags after terminating.The content of sulphur and phosphorus is respectively S in molten steel after processing：
0.0015%th, P：0.00065%.
6th step process, LF stove deoxidization desulfuration techniques, this is walked in process：Alloy is carried out using high carbon ferromanganese, ferrosilicon first
Change, such as Q235 steel grades, high carbon ferromanganese alloy addition 2.4kg/ stoves, Antaciron 3.5kg/ stoves；Then oxygen feeding aluminum steel+steel is determined
Bag top slag deoxidation, the control of Als contents is 0.04%, and active lime addition is 15kg/t steel, and fluorite addition is 3kg/t steel；
Argon stir process degree is defined by the exposed diameter of molten steel no more than 18cm, 7 minutes Argon stir process time.Molten steel after processing
The content of middle sulphur and phosphorus is respectively S：0.00024%th, P：0.00055%, reach target call.
Subsequent technique, such as RH, continuous casting, according to steel-making general technology.
Embodiment 3 is made steel using the inventive method
Raw material：Hot metal containing V-Ti, main component are
C：4.8%th, Si：1.0%th, Mn：1.0%th, V：0.4%th, Ti：0.5%th, S：0.10%th, P：0.08%, surplus is
Tfe, temperature are 1390 DEG C.
First step process, carry out desulphurization and slag skimming：In this step process, injection magnesium powder dosage is 1.2kg/t iron, and passive lime is used
Measure as 4.5kg/ iron.Molten steel sulfur content is 0.009% after processing.
Second step process, converter extracting vanadium Dephosphorization vanadium extraction：In this step process, lime adding amount is 20kg/t steel, is freezed off
Pelletizing dosage is 50kg/t steel, oxygen demand 15m3/ t steel, half steel temperature are 1450 DEG C.Half obtained composition of steel includes：C：
4%th, Si：0.02%th, Mn：0.02%th, V：0.04%th, Ti：0.03%th, S：0.005%th, P：0.05%th, surplus Tfe.
Three-procedure, the double slag steel-making of half steel converter catch carbon：In this step process, using quartz sand slag making, quartz sand dosage
For 15kg/t steel；When the carbon content of endpoint molten steel is 0.6%, the slagging of falling stove, slagging amount is the 2/3 of the quantity of slag at that time；Smelt knot
Shu Gangshui oxygen activities are 700ppm；Residue adjustment is carried out using dolomitic lime before tapping, dolomitic lime dosage is 6kg/t steel；Converter goes out
Steel process adds active lime 6kg/t steel and fluorite 1.2kg/t steel.The content of sulphur and phosphorus is respectively S in molten steel after processing：
0.0065%th, P：0.0075%.
4th step process, LF stoves stirring dephosphorization,：In this step process, molten steel adds in LF stoves first not deoxidation, processing procedure
Fluorite 1.2kg/t steel, active lime 20kg/t steel, stir process time are 26 minutes, and Argon stirring extent is exposed straight with molten steel
Footpath is defined no more than 19cm.The content of sulphur and phosphorus is respectively S in molten steel after processing：0.004%th, P：0.002%.
5th step process, it is blown lime and skims, in this step process：Molten steel carries out lime blowing process, stone using spray gun
Grey injecting velocity controls according to 50g/min, is blown time 12min；After injection terminates, molten steel is skimmed, bright face rate 89%；
Processing adds 0.5kg/t steel ladle top slags after terminating.The content of sulphur and phosphorus is respectively S in molten steel after processing：0.0025%th, P：
0.00095%.
6th step process, LF stove deoxidization desulfuration techniques, this is walked in process：Alloy is carried out using high carbon ferromanganese, ferrosilicon first
Change, such as Q235 steel grades, high carbon ferromanganese alloy addition 2.6kg/ stoves, Antaciron 4kg/ stoves；Then oxygen feeding aluminum steel+ladle is determined
Slag deoxidation is pushed up, the control of Als contents is 0.06%, and active lime addition is 25kg/t steel, and fluorite addition is 5kg/t steel；Blow
Argon stir process degree is defined by the exposed diameter of molten steel no more than 19cm, 7 minutes Argon stir process time.After processing in molten steel
The content of sulphur and phosphorus is respectively S：0.0003%th, P：0.0008%, reach target call.
Subsequent technique, such as RH, continuous casting, according to steel-making general technology.
Comparative example
In the 200 tons of converters of certain steel mill, according in general processing route, " desulphurization and slag skimming+steel converter of converter extracting vanadium vanadium extraction+half refines
Steel+LF stove deoxidization desulfurations technique " and auxiliary material addition can not possibly obtain be based on hot metal containing V-Ti under the conditions of phosphorus content≤
0.001%, while the molten steel of sulfur content≤0.0005%.
Claims (3)
1. low-phosphorous low-sulfur method for making steel, it is characterised in that：Molten iron used in steel-making is vanadium-titanium-iron-water, the vanadium-titanium-iron-water it is main into
It is divided into
C：3.5%~4.8%, Si：0.1%~1.0%, Mn：0.1%~1.0%, V：0.05~0.4%, Ti：0.05~
0.5%th, S：0.060~0.10%, P：0.060~0.080%, surplus Tfe, temperature are 1250 DEG C~1390 DEG C；
This method includes the double slag steel-making of desulphurization and slag skimming, the vanadium extraction of converter extracting vanadium Dephosphorization, half steel converter catch carbon, the LF carried out successively
Stove stirring dephosphorization, injection lime are simultaneously skimmed and LF stove deoxidization desulfuration steps；
In the desulphurization and slag skimming step, injection magnesium powder dosage is 0.9~1.2kg/t iron, and passive lime dosage is 3.5~4.5kg/
Iron；
In the converter extracting vanadium Dephosphorization vanadium extraction step, lime adding amount is 10~20kg/t steel, and cooled agglomerated pellet dosage is 30
~50kg/t steel, oxygen demand are controlled in 10~15m3Between/t steel, half steel temperature control is between 1350~1450 DEG C；
In the double slag steel-making steps of the half steel converter catch carbon, using quartz sand slag making, quartz sand dosage is 10~15kg/t steel；When
When endpoint molten steel carbon content is 0.3~0.6%, the slagging of falling stove, slagging amount is the 1/2~2/3 of the quantity of slag at that time；Smelt and terminate molten steel
Oxygen activity ＞ 600ppm；Residue adjustment is carried out using dolomitic lime before tapping, dolomitic lime dosage is 4~6kg/t steel；Converter tapping mistake
Journey adds 4~6kg/t of active lime steel and fluorite 0.8~1.2kg/t steel；
In the LF stoves stirring dephosphorization step, the molten steel LF stove not deoxidations of the double slag steel-making step productions of half steel converter catch carbon, processing
Process adds fluorite 0.8~1.2kg/t steel, active lime 10~20kg/t steel；The stir process time is not less than 20 minutes, Argon
Stirring extent is defined by the exposed diameter of molten steel no more than 20cm；
In the injection lime and step of skimming, lime injecting velocity is controlled between 45~50kg/min, is blown time control
In 12min；After injection terminates, molten steel is skimmed, bright face rate ＞ 85%；Processing terminate add ladle top slag 0.3~
0.5kg/t steel；
In the LF stoves deoxidization desulfuration step, alloying is carried out using high carbon ferromanganese, ferrosilicon first；Then carry out determining oxygen feeding aluminium
Line+ladle top slag deoxidation, Als are controlled between 0.04~0.06%, and active lime addition is 15~25kg/t steel, and fluorite adds
It is 3~5kg/t steel to enter amount；Argon stir process degree is defined by the exposed diameter of molten steel no more than 20cm, during Argon stir process
Between be not less than 8 minutes；
Wherein, the content of above-mentioned each chemical composition is by weight percentage.
2. low-phosphorous low-sulfur method for making steel according to claim 1, it is characterised in that：The double slag steel-making of the half steel converter catch carbon
In step, dolomitic lime composition is
CaO：40~50%, MgO：30~40%, surplus CaCO3And MgCO3；
Active lime composition is
CaO：>=90%, surplus CaCO3；
Wherein, the content of above-mentioned each chemical composition is by weight percentage.
3. low-phosphorous low-sulfur method for making steel according to claim 1, it is characterised in that：The injection lime and step of skimming
In, ladle top slag composition is
Al2O3:35~45%, CaO：30~40%, Al：25~35%,
Wherein, the content of above-mentioned each chemical composition is by weight percentage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710817709.4A CN107604120B (en) | 2017-09-12 | 2017-09-12 | The extremely low extremely low sulphur method for making steel of phosphorus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710817709.4A CN107604120B (en) | 2017-09-12 | 2017-09-12 | The extremely low extremely low sulphur method for making steel of phosphorus |
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| CN114606362A (en) * | 2022-03-17 | 2022-06-10 | 首钢水城钢铁（集团）有限责任公司 | Converter slag washing desulfurization process |
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